I just made a test on clean environment and did the following: -- installed mingw-get-inst-20100831.exe -- installed MSYS-1.0.11 (both from http://sourceforge.net/projects/mingw/files) When msys installer asked me for postinstall I said NO. Since there are no conflicts, I've copied both into the same root C:\GNU and added C:\GNU\bin to path. I've checked that no other things are present in PATH to be sure that those two (mingw + msys) are enough. Then started a full luatex build (svn trunk) with sh build.sh Works fine. I have also copied the entire directory to another machine (without installing mingw or msys) to be sure that installers do not perform some hidden preconfiguration. They doesn't. So having mingw + msys files tree and adding binaries to PATH is enough. -- Pawe/l Jackowski P.Jackowski@gust.org.pl